Found one file extension association related to VASSAL and 1 file format developed specifically for use with VASSAL.
Platform, operating system: Multiplatform
Go to: VASSAL description
Developer: The VASSAL Team
Developer / company: VASSAL
Vassal is a game engine for building and playing online adaptations of board games and card games. Play live on the Internet or by email. Vassal runs on all platforms, and is free, open-source software.
VASSAL works with the following file extensions:
Note: You can click on any file extension link from the list below, to view its detailed information. The list of extensions used or otherwise associated with the application may not be complete, because many common file extensions on our website, such as jpg (pictures) or txt (text files), can be opened by a large number of applications, or are too general file format. However most, if not all directly associated file extensions should be listed with its appropriate program. Although its likely, that some file extensions may be missing from the list of associated file extensions with the application, yet they can be opened, be part of, or otherwise be associated with the program.
VASSAL default file extension associations
Comparison table of actions that VASSAL can perform with its associated file type beta
This table might not contain all possible associated or supported file types or may contain incorrect data.
If you need more information please contact the developers of VASSAL (The VASSAL Team), or check out their product website.
File type \ Action